Researchers have found a weakness in the AES algorithm. They managed to come up with a clever new attack that can recover the secret key four times easier than anticipated by experts. In the last decade, many researchers have tested the security of the AES algorithm, but no flaws were found so far. The new attack applies to all versions of AES even if it used with a single key. The attack shows that finding the key of AES is four times easier than previously believed; in other words, AES-128 is more like AES-126.

At this point, it's not so much about the encryption itself being secure; we've had more or less "impossible to crack" encryption for many years now. It's all about how secure you keep the key. After all, the most secure door lock in the world is utterly useless if you leave your keychain on the front porch. The same applies to any method of securing data, be it cryptography, obfuscation or physical security.